Mr. HB -- Yeah basically what blackmonk said, you want to be a little away from your opponent and leaning into them a bit. If you are too close your weight will be on top of them and the rib cage will hold the weight better, also the chance of being rolled increases. Pressure should be on the lower ribs coming in slightly from the side, from their pull their shoulders back in toward you (hugging them) will apply the rest of the pressure... and then relax and let them suffer ;)

Yep, getting your own hips too close will lead to disaster. I get pressure on the "floating ribs" and bring them to me as I go to them. It is a dynamic hold that can place the bottom man under a lot of pressure.

No matter if your sport has pinning or not, hypoxia makes cowards of everyone. I like the position as it gives me viable threat no matter where I am at. I go from cross-body, scarf, four corner, reverse scarf, etc. without every giving the man back space to breath.

Overall this is an underused position, that warrants in depth study. Systematically work it for several years and it will click in.